EP0509379A1 - Electromagnetic micromotor with axial flux - Google Patents

Electromagnetic micromotor with axial flux Download PDF

Info

Publication number
EP0509379A1
EP0509379A1 EP92106038A EP92106038A EP0509379A1 EP 0509379 A1 EP0509379 A1 EP 0509379A1 EP 92106038 A EP92106038 A EP 92106038A EP 92106038 A EP92106038 A EP 92106038A EP 0509379 A1 EP0509379 A1 EP 0509379A1
Authority
EP
European Patent Office
Prior art keywords
rotor
micromotor
air gap
micromotor according
rotation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92106038A
Other languages
German (de)
French (fr)
Other versions
EP0509379B1 (en
Inventor
Taghezout Daho
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ETA SA Manufacture Horlogere Suisse
Ebauchesfabrik ETA AG
Original Assignee
Ebauchesfabrik ETA AG
Eta SA Fabriques dEbauches
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ebauchesfabrik ETA AG, Eta SA Fabriques dEbauches filed Critical Ebauchesfabrik ETA AG
Publication of EP0509379A1 publication Critical patent/EP0509379A1/en
Application granted granted Critical
Publication of EP0509379B1 publication Critical patent/EP0509379B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K99/00—Subject matter not provided for in other groups of this subclass

Definitions

  • the present invention relates to an electromagnetic axial flow micromotor, and more particularly to a miniaturized step micromotor.
  • a micromotor of the aforementioned type which comprises a stator with respect to which a magnetic rotor is pivotally mounted about an axis of rotation.
  • This rotor comprises at least one pair of magnetic poles producing in a gap an magnetic field which is substantially parallel to said axis of rotation of the rotor.
  • this micromotor comprises at least one substantially flat coil placed in said air gap, perpendicular to the axis of rotation, so as to intercept the flow created by the field.
  • the coil is formed in one face of a semiconductor wafer and it is manufactured according to conventional techniques for manufacturing integrated circuits.
  • the air gap is defined by two parallel flanges with high magnetic permeability, one being integral with the rotor while the other is fixedly mounted on the stator.
  • the magnetic fluxes generated respectively by the magnetic rotor and by the coil or coils circulate between the two flanges which are movable relative to one another. This structure results in the creation of friction forces associated with magnetic attraction, which reduce the efficiency of the micromotor.
  • the object of the invention is therefore to remedy this drawback by providing an electromagnetic micromotor with high efficiency and whose structure adapts particularly well to the techniques for manufacturing miniaturized micromotors.
  • the two flanges can rotate concomitantly, thus eliminating the phenomena of magnetic friction between these flanges.
  • this micromotor which comprises first and second flanges with magnetic permeability, the first of which is mechanically integral with the rotor, is further characterized in that the second flange is also mechanically integral with the rotor and defines with the first flange said air gap.
  • the two flanges are made integral with the rotor by means of a first and a second sleeve respectively, which are both mounted free in rotation on a tenon.
  • an electromagnetic micromotor with axial flow is generally designated by the reference 1.
  • This micromotor 1 comprises a stator 2 and a magnetic rotor 4 which is pivotally mounted around a geometric axis of rotation Xr, relative to the stator 2.
  • the rotor 4 comprises at least one pair of magnetic poles (not shown in the figure) producing in a gap E a magnetic field H substantially parallel to said axis of rotation Xr of the rotor 4.
  • the rotor 4 is composed of a circular disc 6 magnetized and of a first flange 8 with high magnetic permeability.
  • the motor also comprises substantially planar coils 10.
  • the coils 10 are placed in said air gap E perpendicular to the axis of rotation Xr, so as to intercept a flux created by the field H.
  • the coils 10 are formed on a substrate 12 made of an electrically insulating material, such as a material semiconductor formed by silicon and comprising at its center, coaxial with the axis Xr, a through bore 13. Again, these coils have a structure identical to those described in the document which was mentioned above.
  • the micromotor comprises a second flange 14 with high magnetic permeability, preferably made, like the first flange 8, in a soft magnetic material.
  • This second flange 14 is located opposite the free face of the disc 6 and is mechanically integral with the rotor 4.
  • the air gap E is defined by the two flanges 8 and 14 which are both integral with the rotor 4 and which are likely to move concomitantly with respect to the stator 2, during the operation of the micromotor, that is to say during the passage of a current in the excitation coils 10. It is therefore understood that the air gap E is delimited only by the rotor 4 since it is defined by the two movable flanges 8 and 14 which form an integral part of the rotor 4.
  • the two flanges 8 and 14 are made integral with the rotor 4 by means of a first bush 16 and a second bush 18 respectively mounted freely in rotation on a tenon 20.
  • the second socket 18 which is directly mounted on the pin 20 has at its lower part, considering the micromotor according to the invention in its position as shown in Figure 1, a base 19 which rests by an axial contact, that is to say -to say parallel to the axis Xr, on a base 22 secured to the lug 20.
  • the base 19 comprises, opposite the base 22, a first circular collar 21, called the internal collar. This inner collar 21 has a friction surface resting directly on the base 22.
  • the lug 20 extends perpendicular to the base 22 and comes integrally with the latter.
  • the base 22 is housed in a support 24.
  • the support 24 is preferably made of a non-magnetic material such as brass and it comprises two stepped recesses 26 and 28 whose dimensions and shapes are designed to receive at least the base 22 and the second flange 14 respectively.
  • These recesses 26 and 28 in which the base 22 are housed, as well as at least for each part of the base 19 and the second flange 14, are covered by the substrate 12 which rests by its outer edge on an upper face of the support 24, in the vicinity of a cylindrical wall which delimits the recess 28.
  • the tenon 20 is fixed relative to the support 24 since the base 22 is fixedly held in the bottom of the recess 26 by a weld bead 27.
  • the two sockets 16 and 18 are fitted coaxially and are preferably driven one over the other. More particularly, the sleeve 16 which is the outermost relative to the geometric axis Xr is driven directly onto the inner sleeve 18.
  • the sleeve 18 has a body 30 which rises from the base 19. At the distal part of the body 30, relative to the base 19, is provided a bearing surface 31 whose outside diameter is slightly greater than that of the body 30, which allows a force fitting of the first sleeve 16 on a relatively short engagement length the second 18.
  • the tenon 20 and the sockets 16 and 18 pass right through the semiconductor substrate 12, through the through bore 13.
  • the sockets 16 and 18 respectively have shoulders 32 and 34 on which the flanges 8 and 14 respectively rest.
  • the magnetic circular disc 6 has advantageously been driven out on the first socket 16 so that the first flange 8 either sandwiched between the shoulder 32 and the magnetic circular disk 6.
  • the sleeve 16, the first flange 8 and the magnetic circular disk 6 form a unit U1 which can be pre-assembled, then mounted on the body 30 of the second sleeve 18 , already positioned on the tenon 20.
  • the second sleeve 18 can be preassembled with the second flange 14 which is held thereon at least in position during the preassembly by an adhesive joint 36.
  • the second sleeve 18 and the second flange 14 also form a unit U2.
  • the second flange 14 As regards the second flange 14, it is mounted with a radial clearance J1 on the body 30 of the second socket 18 and it rests directly on the shoulder 34. In addition, the second flange 14 is held on the second socket 18 by one of the free ends, referenced 38, of the first socket 16. It is thus understood that the second flange 14 is held in sandwich between the free end 38 of the first socket 16 and the shoulder 34 of the second socket 18 Note that the shoulder 34 is formed directly on the base 19. Coming into abutment against the second flange 14, the free end 38 of the first sleeve 16 defines a width 1 of the air gap E.
  • the tenon 20 has two bearing surfaces 40 and 42 respectively distal and proximal relative to the base 22 and on which is directly mounted free in rotation, the second sleeve 18. More specifically, the proximal bearing 42 is formed in the vicinity of the base 22 and the bearing distal 40 is formed in the vicinity of the free end of the lug 20.
  • the tenon 20 extends over the entire length of the second sleeve 18, or even beyond, and that it thus crosses the entire rotor 4. Such a construction makes it possible in particular to ensure precise mounting and guidance rotor 4.
  • the base 19 comprises, opposite the base 22, a second circular collar 50 which is capable of coming into contact with the base 22 in the event of the deflection of the tenon 20.
  • This second collar 50 is coaxial with the first 21, and it is arranged around the latter.
  • the two coaxial collars 21 and 50 are arranged respectively internally and externally.
  • the guard G1 between this peripheral collar 50 and the base 22 is calculated so that the deflection of the tenon 20 remains within the limit of elastic resistance to bending and that neither the flange 14 nor the magnetic disc 6 can come to rub on the substrate 12.
  • a pinion 60 is driven onto the first bush 16, in the vicinity of its free end which projects outwardly from the micromotor 1. It will be noted that this pinion 60 could be directly provided machining in the mass, on the first socket 16.
  • the axial displacement of the movable assembly formed by the two sockets 16 and 18 provided with the flanges 8 and 14 and the permanent magnet 6, is limited by a stop formed by a ring threaded 62 screwed onto the free end of the tenon 20.
  • the ring 62 can be driven out on the tenon 20 or it can be blocked by conventional means, not shown, such as a lock nut or crimping.
  • the body 30 of the inner sleeve 18 projects substantially from the outer sleeve 16, in the vicinity of the free end of the lug 20.
  • the inner sleeve 18 has a free protruding end which forms a support part 63 able to come into axial contact on the threaded ring 62.
  • the free end of the stud 20 is engaged in a plate 64, such as a gear train.
  • the axial stop is here provided by the plate 64 itself, on one face of which the bearing part 63 of the second bush 18 can come to rest.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Windings For Motors And Generators (AREA)

Abstract

The invention relates to an electromagnetic micromotor with axial flux. <??>This micromotor includes a stator (2) and a rotor (4) which is mounted pivotably with respect to the stator (2) about an axis of rotation (Xr), the rotor (4) including at least one pair of magnetic poles producing in an air gap (E) a magnetic field (H) substantially parallel to the axis of rotation (Xr), and at least one substantially flat coil (10) placed in the air gap (E) so as to intercept a flux created by the field (H), this micromotor being characterised in that the air gap (E) is delimited solely by the rotor (4). <??>This micromotor applies to the driving of any mechanism. <IMAGE>

Description

La présente invention concerne un micromoteur électromagnétique à flux axial, et plus particulièrement un micromoteur pas à pas miniaturisé.The present invention relates to an electromagnetic axial flow micromotor, and more particularly to a miniaturized step micromotor.

On connaît déjà, d'après notamment le brevet CH 668 160 un micromoteur du type susmentionné, et qui comporte un stator par rapport auquel un rotor aimanté est monté pivotant autour d'un axe de rotation. Ce rotor comporte au moins une paire de pôles magnétiques produisant dans un entrefer un champ magnétique qui est sensiblement parallèle audit axe de rotation du rotor. De plus, ce micromoteur comprend au moins une bobine sensiblement plane placée dans ledit entrefer, perpendiculairement à l'axe de rotation, de manière à intercepter le flux créé par le champ. Selon ce document, la bobine est ménagée dans une face d'une plaquette en semiconducteur et elle est fabriquée selon les techniques classiques de fabrication des circuits intégrés. Dans ce type de moteur, l'entrefer est défini par deux flasques parallèles à haute perméabilité magnétique, l'un étant solidaire du rotor tandis que l'autre est monté fixe sur le stator. En fonctionnement, les flux magnétiques engendrés respectivement par le rotor aimanté et par la ou les bobines, circulent entre les deux flasques qui sont mobiles l'un par rapport à l'autre. Il résulte de cette structure la création de forces de frottement associées à l'attraction magnétique, qui diminuent le rendement du micromoteur.Already known, in particular from patent CH 668 160, a micromotor of the aforementioned type, and which comprises a stator with respect to which a magnetic rotor is pivotally mounted about an axis of rotation. This rotor comprises at least one pair of magnetic poles producing in a gap an magnetic field which is substantially parallel to said axis of rotation of the rotor. In addition, this micromotor comprises at least one substantially flat coil placed in said air gap, perpendicular to the axis of rotation, so as to intercept the flow created by the field. According to this document, the coil is formed in one face of a semiconductor wafer and it is manufactured according to conventional techniques for manufacturing integrated circuits. In this type of motor, the air gap is defined by two parallel flanges with high magnetic permeability, one being integral with the rotor while the other is fixedly mounted on the stator. In operation, the magnetic fluxes generated respectively by the magnetic rotor and by the coil or coils, circulate between the two flanges which are movable relative to one another. This structure results in the creation of friction forces associated with magnetic attraction, which reduce the efficiency of the micromotor.

Aussi l'invention a-t-elle pour but de remédier à cet inconvénient en fournissant un micromoteur électromagnétique à rendement élevé et dont la structure s'adapte particulièrement bien aux techniques de fabrication des micromoteurs miniaturisés.The object of the invention is therefore to remedy this drawback by providing an electromagnetic micromotor with high efficiency and whose structure adapts particularly well to the techniques for manufacturing miniaturized micromotors.

L'invention a donc pour objet un micromoteur électromagnétique à flux axial, du type comportant :

  • un stator,
  • un rotor aimanté monté pivotant autour d'un axe de rotation par rapport au stator, ce rotor comportant au moins une paire de pôles magnétiques produisant dans un entrefer un champ magnétique sensiblement parallèle audit axe de rotation du rotor, et
  • au moins une bobine sensiblement plane, placée dans ledit entrefer, perpendiculairement à l'axe de rotation, de manière à intercepter un flux créé par le champ, ce micromoteur étant caractérisé en ce que ledit entrefer est délimité uniquement par le rotor.
The subject of the invention is therefore an electromagnetic axial flow micromotor, of the type comprising:
  • a stator,
  • a magnetic rotor mounted pivoting about an axis of rotation relative to the stator, this rotor comprising at least one pair of magnetic poles producing in an air gap a magnetic field substantially parallel to said axis of rotation of the rotor, and
  • at least one substantially flat coil, placed in said air gap, perpendicular to the axis of rotation, so as to intercept a flow created by the field, this micromotor being characterized in that said air gap is delimited only by the rotor.

Grâce à cette caractéristique, les deux flasques peuvent tourner de façon concomitante éliminant ainsi les phénomènes de frottement magnétique entre ces flasques.Thanks to this characteristic, the two flanges can rotate concomitantly, thus eliminating the phenomena of magnetic friction between these flanges.

Selon une caractéristique avantageuse de l'invention, ce micromoteur qui comporte un premier et un second flasque à perméabilité magnétique dont le premier est mécaniquement solidaire du rotor, est caractérisé de plus en ce que le second flasque est également solidaire mécaniquement du rotor et définit avec le premier flasque ledit entrefer.According to an advantageous characteristic of the invention, this micromotor which comprises first and second flanges with magnetic permeability, the first of which is mechanically integral with the rotor, is further characterized in that the second flange is also mechanically integral with the rotor and defines with the first flange said air gap.

Selon un autre mode de réalisation de l'invention, les deux flasques sont rendus solidaires du rotor par l'intermédiaire respectivement d'une première et d'une seconde douille qui sont toutes deux montées libres en rotation sur un tenon.According to another embodiment of the invention, the two flanges are made integral with the rotor by means of a first and a second sleeve respectively, which are both mounted free in rotation on a tenon.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description qui suit de modes de réalisation non limitatifs, en liaison avec les dessins annexés dans lesquels :

  • la figure 1 représente une vue en coupe longitudinale d'un micromoteur électromagnétique selon un premier mode de réalisation de l 'invention, et
  • la figure 2 est une vue similaire à la figure 1, mais représentant un deuxième mode de réalisation de 1 'invention.
Other characteristics and advantages of the invention will appear on reading the following description of nonlimiting embodiments, in conjunction with the appended drawings in which:
  • FIG. 1 represents a view in longitudinal section of an electromagnetic micromotor according to a first embodiment of the invention, and
  • Figure 2 is a view similar to Figure 1, but showing a second embodiment of one invention.

En se référant aux figures 1 et 2, on voit un micromoteur électromagnétique à flux axial désigné généralement par la référence 1.Referring to FIGS. 1 and 2, an electromagnetic micromotor with axial flow is generally designated by the reference 1.

Ce micromoteur 1 comporte un stator 2 et un rotor aimanté 4 qui est monté pivotant autour d'un axe géométrique de rotation Xr, par rapport au stator 2. Le rotor 4 comporte au moins une paire de pôles magnétiques (non représentés sur la figure) produisant dans un entrefer E un champ magnétique H sensiblement parallèle audit axe de rotation Xr du rotor 4. A cet effet, le rotor 4 est composé d'un disque circulaire 6 aimanté et d'un premier flasque 8 à haute perméabilité magnétique. Pour la construction du disque 6 et du flasque 8, on se référera à la description du document suisse susmentionné. Le moteur comporte en outre des bobines 10 sensiblement planes. Ces bobines sont placées dans ledit entrefer E perpendiculairement à l'axe de rotation Xr, de manière à intercepter un flux créé par le champ H. Les bobines 10 sont ménagées sur un substrat 12 réalisé en un matériau électriquement isolant, tel qu'un matériau semiconducteur formé par du silicium et comportant en son centre, coaxialement à l'axe Xr, un alésage débouchant 13. Là encore, ces bobines ont une structure identique à celles décrites dans le document qui a été mentionné ci-avant.This micromotor 1 comprises a stator 2 and a magnetic rotor 4 which is pivotally mounted around a geometric axis of rotation Xr, relative to the stator 2. The rotor 4 comprises at least one pair of magnetic poles (not shown in the figure) producing in a gap E a magnetic field H substantially parallel to said axis of rotation Xr of the rotor 4. For this purpose, the rotor 4 is composed of a circular disc 6 magnetized and of a first flange 8 with high magnetic permeability. For the construction of disc 6 and flange 8, reference is made to the description of the above-mentioned Swiss document. The motor also comprises substantially planar coils 10. These coils are placed in said air gap E perpendicular to the axis of rotation Xr, so as to intercept a flux created by the field H. The coils 10 are formed on a substrate 12 made of an electrically insulating material, such as a material semiconductor formed by silicon and comprising at its center, coaxial with the axis Xr, a through bore 13. Again, these coils have a structure identical to those described in the document which was mentioned above.

Selon l'invention, le micromoteur comporte un second flasque 14 à haute perméabilité magnétique, de préférence réalisé, comme le premier flasque 8, en un matériau magnétique doux. Ce second flasque 14 se trouve en regard de la face libre du disque 6 et est solidaire mécaniquement du rotor 4. Ainsi, l'entrefer E est défini par les deux flasques 8 et 14 qui sont tous les deux solidaires du rotor 4 et qui sont susceptibles de se déplacer de façon concomitante par rapport au stator 2, lors du fonctionnement du micromoteur, c'est-à-dire lors du passage d'un courant dans les bobines d'excitation 10. On comprend donc que l'entrefer E est délimité uniquement par le rotor 4 puisqu'il est défini par les deux flasques mobiles 8 et 14 qui font partie intégrante du rotor 4.According to the invention, the micromotor comprises a second flange 14 with high magnetic permeability, preferably made, like the first flange 8, in a soft magnetic material. This second flange 14 is located opposite the free face of the disc 6 and is mechanically integral with the rotor 4. Thus, the air gap E is defined by the two flanges 8 and 14 which are both integral with the rotor 4 and which are likely to move concomitantly with respect to the stator 2, during the operation of the micromotor, that is to say during the passage of a current in the excitation coils 10. It is therefore understood that the air gap E is delimited only by the rotor 4 since it is defined by the two movable flanges 8 and 14 which form an integral part of the rotor 4.

Selon une autre caractéristique de l'invention, les deux flasques 8 et 14 sont rendus solidaires du rotor 4 par l'intermédiaire respectivement d'une première douille 16 et d'une seconde douille 18 montées libres en rotation sur un tenon 20. La seconde douille 18 qui est directement montée sur le tenon 20 comporte à sa partie inférieure, en considérant le micromoteur selon l'invention dans sa position telle que représentée à la figure 1, une base 19 qui repose par un contact axial, c'est-à-dire parallèle à l'axe Xr, sur un socle 22 solidaire du tenon 20. A cet effet, la base 19 comporte en regard du socle 22 un premier collet circulaire 21, dit collet intérieur. Ce collet intérieur 21 présente une surface de frottement reposant directement sur le socle 22. Le tenon 20 s'étend perpendiculairement au socle 22 et vient de matière avec celui-ci. Le socle 22 est logé dans un support 24. Le support 24 est réalisé de préférence en un matériau amagnétique tel que du laiton et il comporte deux évidements étagés 26 et 28 dont les dimensions et formes sont prévues pour recevoir respectivement au moins le socle 22 et le second flasque 14. Ces évidements 26 et 28 dans lesquels sont logés le socle 22, ainsi qu'au moins pour chacun une partie de la base 19 et le second flasque 14, sont recouverts par le substrat 12 qui repose par son bord extérieur sur une face supérieure du support 24, au voisinage d'une paroi cylindrique qui délimite l'évidement 28.According to another characteristic of the invention, the two flanges 8 and 14 are made integral with the rotor 4 by means of a first bush 16 and a second bush 18 respectively mounted freely in rotation on a tenon 20. The second socket 18 which is directly mounted on the pin 20 has at its lower part, considering the micromotor according to the invention in its position as shown in Figure 1, a base 19 which rests by an axial contact, that is to say -to say parallel to the axis Xr, on a base 22 secured to the lug 20. For this purpose, the base 19 comprises, opposite the base 22, a first circular collar 21, called the internal collar. This inner collar 21 has a friction surface resting directly on the base 22. The lug 20 extends perpendicular to the base 22 and comes integrally with the latter. The base 22 is housed in a support 24. The support 24 is preferably made of a non-magnetic material such as brass and it comprises two stepped recesses 26 and 28 whose dimensions and shapes are designed to receive at least the base 22 and the second flange 14 respectively. These recesses 26 and 28 in which the base 22 are housed, as well as at least for each part of the base 19 and the second flange 14, are covered by the substrate 12 which rests by its outer edge on an upper face of the support 24, in the vicinity of a cylindrical wall which delimits the recess 28.

On remarquera que le tenon 20 est fixe par rapport au support 24 puisque le socle 22 est maintenu fixement dans le fond de l'évidement 26 par un cordon de soudure 27.It will be noted that the tenon 20 is fixed relative to the support 24 since the base 22 is fixedly held in the bottom of the recess 26 by a weld bead 27.

Les deux douilles 16 et 18 sont emmanchées coaxialement et sont de préférence chassées l'une sur l'autre. Plus particulièrement, la douille 16 qui est la plus extérieure par rapport à l'axe géométrique Xr est chassée directement sur la douille intérieure 18. La douille 18 comporte un corps 30 qui s'élève à partir de la base 19. A la partie distale du corps 30, par rapport à la base 19, est ménagée une portée 31 dont le diamètre extérieur est légèrement supérieur à celui du corps 30, ce qui permet sur une longueur d'engagement relativement faible un montage à force de la première douille 16 sur la seconde 18.The two sockets 16 and 18 are fitted coaxially and are preferably driven one over the other. More particularly, the sleeve 16 which is the outermost relative to the geometric axis Xr is driven directly onto the inner sleeve 18. The sleeve 18 has a body 30 which rises from the base 19. At the distal part of the body 30, relative to the base 19, is provided a bearing surface 31 whose outside diameter is slightly greater than that of the body 30, which allows a force fitting of the first sleeve 16 on a relatively short engagement length the second 18.

Le tenon 20 ainsi que les douilles 16 et 18 traversent de part en part le substrat semiconducteur 12, par l'intermédiaire de l'alésage débouchant 13.The tenon 20 and the sockets 16 and 18 pass right through the semiconductor substrate 12, through the through bore 13.

Les douilles 16 et 18 comportent respectivement des épaulements 32 et 34 sur lesquels reposent respectivement les flasques 8 et 14. Dans le mode de réalisation représenté, on a avantageusement chassé le disque circulaire aimanté 6 sur la première douille 16 de sorte que le premier flasque 8 soit pris en sandwich entre l'épaulement 32 et le disque circulaire aimanté 6. La douille 16, le premier flasque 8 et le disque circulaire aimanté 6 forment une unité U1 qui peut être préassemblée, puis montée sur le corps 30 de la seconde douille 18, déjà positionnée sur le tenon 20.The sockets 16 and 18 respectively have shoulders 32 and 34 on which the flanges 8 and 14 respectively rest. In the embodiment shown, the magnetic circular disc 6 has advantageously been driven out on the first socket 16 so that the first flange 8 either sandwiched between the shoulder 32 and the magnetic circular disk 6. The sleeve 16, the first flange 8 and the magnetic circular disk 6 form a unit U1 which can be pre-assembled, then mounted on the body 30 of the second sleeve 18 , already positioned on the tenon 20.

On précisera qu'avant d'être montée sur le tenon 20, la seconde douille 18 peut être préassemblée avec le second flasque 14 qui est maintenu sur celle-ci au moins en position lors du préassemblage par un joint de colle 36. La seconde douille 18 et le second flasque 14 forment aussi une unité U2.It will be specified that before being mounted on the tenon 20, the second sleeve 18 can be preassembled with the second flange 14 which is held thereon at least in position during the preassembly by an adhesive joint 36. The second sleeve 18 and the second flange 14 also form a unit U2.

En ce qui concerne le second flasque 14, il est monté avec un jeu radial J1 sur le corps 30 de la seconde douille 18 et il repose directement sur l'épaulement 34. De plus, le second flasque 14 est maintenu sur la seconde douille 18 par l'une des extrémités libres, référencée 38, de la première douille 16. On comprend ainsi que le second flasque 14 est maintenu en sandwich entre l'extrémité libre 38 de la première douille 16 et l'épaulement 34 de la seconde douille 18. On notera que l'épaulement 34 est directement ménagé sur la base 19. En venant en butée contre le second flasque 14, l'extrémité libre 38 de la première douille 16 délimite une largeur 1 de l'entrefer E.As regards the second flange 14, it is mounted with a radial clearance J1 on the body 30 of the second socket 18 and it rests directly on the shoulder 34. In addition, the second flange 14 is held on the second socket 18 by one of the free ends, referenced 38, of the first socket 16. It is thus understood that the second flange 14 is held in sandwich between the free end 38 of the first socket 16 and the shoulder 34 of the second socket 18 Note that the shoulder 34 is formed directly on the base 19. Coming into abutment against the second flange 14, the free end 38 of the first sleeve 16 defines a width 1 of the air gap E.

Le tenon 20 comporte deux portées 40 et 42 respectivement distale et proximale par rapport au socle 22 et sur lesquelles est directement montée libre en rotation, la seconde douille 18. Plus précisément, la portée proximale 42 est ménagée au voisinage du socle 22 et la portée distale 40 est ménagée au voisinage de l'extrémité libre du tenon 20.The tenon 20 has two bearing surfaces 40 and 42 respectively distal and proximal relative to the base 22 and on which is directly mounted free in rotation, the second sleeve 18. More specifically, the proximal bearing 42 is formed in the vicinity of the base 22 and the bearing distal 40 is formed in the vicinity of the free end of the lug 20.

On remarquera que le tenon 20 s'étend sur toute la longueur de la seconde douille 18, voire même au-delà, et qu'il traverse ainsi tout le rotor 4. Une telle construction permet notamment d'assurer un montage et un guidage précis du rotor 4.It will be noted that the tenon 20 extends over the entire length of the second sleeve 18, or even beyond, and that it thus crosses the entire rotor 4. Such a construction makes it possible in particular to ensure precise mounting and guidance rotor 4.

Par ailleurs, la base 19 comporte en regard du socle 22 un second collet circulaire 50 qui est susceptible de venir en contact avec le socle 22 en cas de fléchissement du tenon 20. Ce second collet 50 est coaxial au premier 21, et il est ménagé autour de ce dernier. Par rapport à l'axe de rotation Xr, les deux collets coaxiaux 21 et 50 sont disposés respectivement intérieurement et extérieurement. La garde G1 entre ce collet périphérique 50 et le socle 22 est calculée de telle sorte que le fléchissement du tenon 20 reste dans la limite de résistance élastique à la flexion et que ni le flasque 14, ni le disque aimanté 6 ne puissent venir frotter sur le substrat 12.Furthermore, the base 19 comprises, opposite the base 22, a second circular collar 50 which is capable of coming into contact with the base 22 in the event of the deflection of the tenon 20. This second collar 50 is coaxial with the first 21, and it is arranged around the latter. With respect to the axis of rotation X r , the two coaxial collars 21 and 50 are arranged respectively internally and externally. The guard G1 between this peripheral collar 50 and the base 22 is calculated so that the deflection of the tenon 20 remains within the limit of elastic resistance to bending and that neither the flange 14 nor the magnetic disc 6 can come to rub on the substrate 12.

Pour transmettre le couple fourni par le micromoteur 1 selon l'invention, un pignon 60 est chassé sur la première douille 16, au voisinage de son extrémité libre qui fait extérieurement saillie du micromoteur 1. On précisera que ce pignon 60 pourrait être directement ménagé par usinage dans la masse, sur la première douille 16.To transmit the torque supplied by the micromotor 1 according to the invention, a pinion 60 is driven onto the first bush 16, in the vicinity of its free end which projects outwardly from the micromotor 1. It will be noted that this pinion 60 could be directly provided machining in the mass, on the first socket 16.

Conformément au mode de réalisation représenté à la figure 1, le déplacement axial de l'équipage mobile formé par les deux douilles 16 et 18 pourvues des flasques 8 et 14 et de l'aimant permanent 6, est limité par une butée formée par une bague filetée 62 vissée sur l'extrémité libre du tenon 20. La bague 62 peut être chassée sur le tenon 20 ou elle peut être bloquée par des moyens classiques, non représentés, tels qu'un contre-écrou ou un sertissage. On observera que le corps 30 de la douille intérieure 18 fait sensiblement saillie de la douille extérieure 16, au voisinage de l'extrémité libre du tenon 20. Ainsi, la douille intérieure 18 comporte une extrémité libre en saillie qui forme une partie d'appui 63 apte à venir en contact axial sur la bague filetée 62.According to the embodiment shown in Figure 1, the axial displacement of the movable assembly formed by the two sockets 16 and 18 provided with the flanges 8 and 14 and the permanent magnet 6, is limited by a stop formed by a ring threaded 62 screwed onto the free end of the tenon 20. The ring 62 can be driven out on the tenon 20 or it can be blocked by conventional means, not shown, such as a lock nut or crimping. It will be observed that the body 30 of the inner sleeve 18 projects substantially from the outer sleeve 16, in the vicinity of the free end of the lug 20. Thus, the inner sleeve 18 has a free protruding end which forms a support part 63 able to come into axial contact on the threaded ring 62.

On remarquera que le tenon 20 est fixe par rapport à la plaque 64, ces deux éléments ne présentant aucun mouvement relatif.It will be noted that the pin 20 is fixed relative to the plate 64, these two elements having no relative movement.

Dans le mode de réalisation de la figure 2, l'extrémité libre du tenon 20 est engagée dans une plaque 64, telle qu'un pont de rouage. La butée axiale est ici fournie par la plaque 64 elle-même, sur une face de laquelle peut venir reposer la partie d'appui 63 de la seconde douille 18.In the embodiment of Figure 2, the free end of the stud 20 is engaged in a plate 64, such as a gear train. The axial stop is here provided by the plate 64 itself, on one face of which the bearing part 63 of the second bush 18 can come to rest.

Claims (10)

Micromoteur électromagnétique à flux axial, du type comportant : - un stator (2), - un rotor aimanté (4) monté pivotant par rapport au stator (2) autour d'un axe de rotation (Xr), ce rotor (4) comportant au moins une paire de pôles magnétiques produisant dans un entrefer (E) un champ magnétique (H) sensiblement parallèle audit axe de rotation (Xr), et - au moins une bobine (10) sensiblement plane, placée dans ledit entrefer (E), perpendiculairement à l'axe de rotation (Xr), de manière à intercepter un flux créé par le champ (H), caractérisé en ce que ledit entrefer (E) est délimité uniquement par le rotor (4). Electromagnetic axial flow micromotor, of the type comprising: - a stator (2), - a magnetic rotor (4) pivotally mounted relative to the stator (2) about an axis of rotation (Xr), this rotor (4) comprising at least one pair of magnetic poles producing in a gap (E) a magnetic field (H) substantially parallel to said axis of rotation (Xr), and - at least one substantially flat coil (10), placed in said air gap (E), perpendicular to the axis of rotation (Xr), so as to intercept a flow created by the field (H), characterized in that said air gap (E) is delimited only by the rotor (4). Micromoteur selon la revendication 1, comportant un premier et un second flasques (8, 14) à haute perméabilité magnétique dont le premier (8) est mécaniquement solidaire du rotor (4), caractérisé en ce que le second flasque (14) est également solidaire mécaniquement du rotor (4) et définit avec le premier (8) ledit entrefer (E).Micromotor according to claim 1, comprising first and second flanges (8, 14) with high magnetic permeability, the first (8) of which is mechanically secured to the rotor (4), characterized in that the second flange (14) is also secured mechanically of the rotor (4) and defines with the first (8) said air gap (E). Micromoteur selon la revendication 1 ou 2, caractérisé en ce que les deux flasques (8, 14) sont respectivement rendus solidaires du rotor (4) par l'intermédiaire d'une première et d'une seconde douilles (16, 18), montées libres en rotation sur un tenon (20).Micromotor according to claim 1 or 2, characterized in that the two flanges (8, 14) are respectively made integral with the rotor (4) by means of first and second sockets (16, 18), mounted free to rotate on a tenon (20). Micromoteur selon la revendication 3, caractérisé en ce que les douilles (16, 18) sont emmanchées coaxialement.Micromotor according to claim 3, characterized in that the sockets (16, 18) are fitted coaxially. Micromoteur selon la revendication 3 ou 4, caractérisé en ce que les deux douilles (16, 18) sont chassées l'une sur l'autre.Micromotor according to claim 3 or 4, characterized in that the two sockets (16, 18) are driven one over the other. Micromoteur selon l'une des revendications 3 à 5, caractérisé en ce que les douilles (16, 18) comportent respectivement des épaulements (32, 34) sur lesquels reposent respectivement les flasques (8, 14).Micromotor according to one of Claims 3 to 5, characterized in that the sockets (16, 18) respectively have shoulders (32, 34) on which the flanges (8, 14) respectively rest. Micromoteur selon l'une des revendications 3 à 6, caractérisé en ce que le second flasque (14) est maintenu sur la seconde douille (18) par une extrémité libre de la première douille (16).Micromotor according to one of claims 3 to 6, characterized in that the second flange (14) is held on the second socket (18) by a free end of the first socket (16). Micromoteur selon l'une des revendications 3 à 7, caractérisé en ce que l'extrémité libre de la première douille (16) vient en butée sur le second flasque (14) et délimite la largeur dudit entrefer (E).Micromotor according to one of claims 3 to 7, characterized in that the free end of the first sleeve (16) comes in stop on the second flange (14) and delimits the width of said air gap (E). Micromoteur selon l'une des revendications 3 à 8, caractérisé en ce que ledit tenon (20) comporte deux portées respectivement distale (40) et proximale (42) sur lesquelles est montée libre en rotation la seconde douille (18).Micromotor according to one of claims 3 to 8, characterized in that said pin (20) has two respectively distal (40) and proximal (42) bearing surfaces on which the second sleeve (18) is mounted to rotate freely. Micromoteur selon l'une des revendications 3 à 7, caractérisé en ce que le tenon (20) s'étend sur toute la longueur de la seconde douille (18).Micromotor according to one of Claims 3 to 7, characterized in that the pin (20) extends over the entire length of the second sleeve (18).
EP92106038A 1991-04-11 1992-04-08 Electromagnetic micromotor with axial flux Expired - Lifetime EP0509379B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9104559 1991-04-11
FR9104559A FR2675322A1 (en) 1991-04-11 1991-04-11 ELECTROMAGNETIC MICROMOTOR WITH AXIAL FLUX.

Publications (2)

Publication Number Publication Date
EP0509379A1 true EP0509379A1 (en) 1992-10-21
EP0509379B1 EP0509379B1 (en) 1995-11-15

Family

ID=9411822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92106038A Expired - Lifetime EP0509379B1 (en) 1991-04-11 1992-04-08 Electromagnetic micromotor with axial flux

Country Status (8)

Country Link
US (1) US5216310A (en)
EP (1) EP0509379B1 (en)
JP (1) JP3370997B2 (en)
KR (1) KR100239090B1 (en)
CN (1) CN1031164C (en)
DE (1) DE69206030T2 (en)
FR (1) FR2675322A1 (en)
TW (1) TW204420B (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5412265A (en) * 1993-04-05 1995-05-02 Ford Motor Company Planar micro-motor and method of fabrication
US6169354B1 (en) 1996-05-24 2001-01-02 Halo Data Devices, Inc. Thin film electric motors
US6204588B1 (en) 1999-05-27 2001-03-20 Halo Data Devices, Inc. Rotor capable of being used as a recording media
DE60335198D1 (en) * 2002-08-09 2011-01-13 Yamaha Motor Co Ltd ROTATING ELECTRICAL DEVICE
ATE493634T1 (en) * 2003-04-30 2011-01-15 Leica Geosystems Ag DEVICE FOR ADJUSTING THE ANGLE OF A TARGET UNIT ON A TARGET
JP2007074878A (en) * 2005-09-09 2007-03-22 Toshiba Corp Generator
US7573176B2 (en) * 2005-12-15 2009-08-11 Nissan Motor Co., Ltd. Dynamo-electric machine
US7557482B2 (en) * 2006-07-31 2009-07-07 Caterpillar Inc. Axial-flux electric machine
US20080024035A1 (en) * 2006-07-31 2008-01-31 Caterpillar Inc. Power system
IT1394386B1 (en) * 2008-09-29 2012-06-15 Scuola Superiore Di Studi Universitari E Di Perfez WOBBLE-TYPE ELECTROMAGNETIC STEP-BY-STEP MICROMOTOR
US9257876B2 (en) * 2008-11-14 2016-02-09 Metal Industries Research & Development Centre Motor integrated to electronic device
US8558489B2 (en) 2010-12-02 2013-10-15 Raytheon Company Micro motor
JP5759731B2 (en) * 2011-01-21 2015-08-05 日本電産サンキョー株式会社 Rotation drive
US20150015102A1 (en) * 2012-02-13 2015-01-15 Agency For Science, Technology And Research Motor and a method of assembling the same
WO2013122543A1 (en) * 2012-02-13 2013-08-22 Agency For Science, Technology And Research Motor and method for assembling the same
CN109586534B (en) * 2017-09-29 2021-08-27 日本电产株式会社 Birotor axial flux motor, actuator and electric device
EP4142125A1 (en) 2021-08-26 2023-03-01 Universidad de Alcalá (UAH) Miniaturized electromagnetic rotary actuator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4839551A (en) * 1987-07-17 1989-06-13 Alps Electric Co., Ltd. Brushless motor structure enabling accurate relative positioning of rotor and stator coils

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA660144A (en) * 1963-03-26 Printed Motors Inc. Multiple-winding electrical rotating machines
US4080544A (en) * 1975-03-13 1978-03-21 Canon Kabushiki Kaisha Electric motor
US4181867A (en) * 1975-07-21 1980-01-01 Papst-Motoren Kg Brushless direct-current motor
DE2730142C2 (en) * 1977-07-04 1988-01-21 Papst-Motoren GmbH & Co KG, 7742 St Georgen Brushless DC motor of the two-strand design
US4594524A (en) * 1984-02-22 1986-06-10 Kangyo Denkikiki Kabushiki Kaisha Coreless-brushless motor
JPS6225859A (en) * 1985-07-25 1987-02-03 Matsushita Electric Ind Co Ltd Flat type brushless motor
JPS62103577A (en) * 1985-10-31 1987-05-14 Canon Inc Frequency generator
JPS63107438A (en) * 1986-10-22 1988-05-12 Sankyo Seiki Mfg Co Ltd Bearing apparatus
JPS63209455A (en) * 1987-02-23 1988-08-31 Olympus Optical Co Ltd Motor
US5099162A (en) * 1987-07-22 1992-03-24 Canon Kabushiki Kaisha Coil of superconducting material for electric appliance and motor utilizing said coil
FR2620586A1 (en) * 1987-09-14 1989-03-17 Em Microelectronic Marin Sa METHOD FOR MANUFACTURING ELECTRONIC MODULES, IN PARTICULAR FOR MICROCIRCUIT CARDS
US4949000A (en) * 1988-07-18 1990-08-14 Mueller And Smith, Lpa D.C. motor
US5109171A (en) * 1988-11-11 1992-04-28 Papst-Motoren Gmbh & Co. Kg Low-noise miniature electric motor
JP2864521B2 (en) * 1989-03-22 1999-03-03 松下電器産業株式会社 Brushless motor
US5124604A (en) * 1989-06-15 1992-06-23 Areal Technology Corp. Disk drive motor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4839551A (en) * 1987-07-17 1989-06-13 Alps Electric Co., Ltd. Brushless motor structure enabling accurate relative positioning of rotor and stator coils

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 204 (E-520)(2651), 2 juillet 1987; & JP - A - 62025859 (MATSUSHITA ELECTRIC IND. CO. LTD) 03.02.1987 *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 498 (E-698)(3345), 26 décembre 1988; & JP - A - 63209455 (Olympus Optical Co. Ltd.) 31.08.1988 *

Also Published As

Publication number Publication date
FR2675322A1 (en) 1992-10-16
JP3370997B2 (en) 2003-01-27
DE69206030D1 (en) 1995-12-21
FR2675322B1 (en) 1994-12-16
DE69206030T2 (en) 1996-06-27
CN1065758A (en) 1992-10-28
EP0509379B1 (en) 1995-11-15
US5216310A (en) 1993-06-01
KR920020811A (en) 1992-11-21
TW204420B (en) 1993-04-21
JPH05115164A (en) 1993-05-07
CN1031164C (en) 1996-02-28
KR100239090B1 (en) 2000-01-15

Similar Documents

Publication Publication Date Title
EP0509379B1 (en) Electromagnetic micromotor with axial flux
FR2648632A1 (en) LOW SIZE SINGLE PHASE ELECTROMAGNETIC ACTUATOR
FR3086814A1 (en) ELECTRIC ACTUATOR
CH656927A5 (en) ELECTROMAGNETIC BRAKE.
FR2991247A1 (en) CONTROL DEVICE WITH STOPPING ARRACHEMENT
FR2708060A1 (en) Bearing arrangement for a rotating shaft belonging to a drive mechanism of a wiper.
EP0642704B1 (en) Rotatable single-phase electromagnetic actuator
FR2853155A1 (en) Rotor for DC motor, has retention unit in which one side is connected to shaft or return magnetic flux unit and other side is connected to annular magnet to integrate magnet to shaft or to magnetic flux unit
FR2892572A1 (en) ELECTRIC MACHINE AND MOUNTING METHOD
EP0196966A1 (en) Clutch release mechanism for a motor vehicle
FR2812471A1 (en) Motor/reduction gearing assembly has gearbox and motorbox which contain endless screw, motor and motor brush carrier which has joint fixed to it which is compressed between motor and gearbox
EP0661794B1 (en) Cylindrical electromechanical transducer
FR2523379A1 (en) ENGINE COMPRISING A FIXED SHAFT AND ITS ASSEMBLY METHOD
FR2813105A1 (en) Pulley for vehicle alternator, comrises bell shaped body with profiled rim to support drive belt and inner hub which is threaded to receive shaft end with complementary thread and stop shoulder
WO2003055040A1 (en) Rotating electrical machine comprising means for angular positioning of the field frame relative to the contact brush holder plate
FR2707542A1 (en) Ratchet screwdriver.
EP0901167A1 (en) Base for power diode of vehicle alternator
EP1331126B1 (en) Hybride propulsion system of an automotive vehicle with an elastic coupling device between the rotor of the reversible electric machine and the primary shaft of the gearbox of the automotive vehicle internal combustion engine
EP0964501B1 (en) Braking device for a motor and motor and apparatus equipped with such a device
EP1020977B1 (en) Method of assembling a rotary electric motor
FR2804241A1 (en) VACUUM BULB FOR CIRCUIT BREAKER HAVING LOCKING MOUNTED BEARING
EP0549490A1 (en) Solenoid valve with a flat movable plunger
FR2979126A1 (en) ROTATION DRIVE DEVICE, ESPECIALLY A HEAT ENGINE STARTER AND METHOD FOR CARRYING OUT SAID METHOD
EP0687055A1 (en) Improvements in motor vehicle transmissions having an Eddy current retarder brake, and in the mounting arrangement of these transmissions
EP0728906A1 (en) Electric motor with zero current braking device

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE GB LI

17P Request for examination filed

Effective date: 19921112

17Q First examination report despatched

Effective date: 19940705

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE GB LI

REF Corresponds to:

Ref document number: 69206030

Country of ref document: DE

Date of ref document: 19951221

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: ICB INGENIEURS CONSEILS EN BREVETS SA

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19960202

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20050401

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20061101

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20100324

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20100329

Year of fee payment: 19

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20110408

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110430

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110408